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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66294e723169564b7cefa4664b40fe5d1c0fa6f6e2b194b8993e815970eac7a' 
  AND token = 'by2mfs6y2XJ2WjhLZqhxEk8Twfo/w0RMHVXMdauxbtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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