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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e853503272014b625c8bec7b3765020f69cb5ee8419697e59321c64f3c4ea3bd' 
  AND token = 'ilfgAOeijx4urt9QC6xRGOin4EFLEJBufCUeJVqEN1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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