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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfa2bb0396c59f83fe1acec321d25a7ab5ffd93283806d6f0109703597c78de' 
  AND token = 'cM9uPsP4r7KgJTIpOOJGNuNo+R5M8clsufeUzWVFnHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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