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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad2c2f7d4eb0ae52a69a3192ed4b95e1c9866ce73e0326b9dc622b4041b09fb' 
  AND token = 'cMgF8m/naJ6AV4+M0zudM728qdCem9Irk23rkjyzolY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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