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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e8189a5ee8880cec86186d930375f91dd7d6a399cb34e02611955dcd5dc69d' 
  AND token = 'sniUx8VTHIVyJ5kx4Ii62SB9RAjWAtOINIHMBq9L9gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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