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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e474e03cc0056557720a06a32edd377cd43c19d2a4c794598bb7c18e586d62' 
  AND token = 'I/MRVYEEMM7y55llskoU+6trOm4x8Mm/vaopp79FwCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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