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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee413e77f2ee1b2f10fff9a426fbd0f204879d7e396673bee80dca53e04a5f8' 
  AND token = 'stJWiP5ZP9IzUroH94NISqRb/Rk0+PODu4J0C5dB9H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}