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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c6987d906c7ec1c564420a3a1a8f64fd2a04f760301dc67dc338b7d229c5d6' 
  AND token = '0Hingmms2Ladpo+/7/spkSvt/gZm4Pyd21tV0m3FeYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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