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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9df656b91410093d80e366d370c5d014ddee06a4357e6bf89b6c0ac5228739' 
  AND token = 'Cu/VdIPz4qLYUYWaUs533LPUbW8CeK497YS6vzszKP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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