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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a9e0576d3b11176e72eeb691b2f6b4948bb3691f62f35bcedfd51d3bf9878c' 
  AND token = 'BKVl3VuBQJ3aDQk9ELN/vgj356Z9I2dPXTID0DDx0dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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