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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2b28fa0b3d035c55a9d4556b61dde1577b7a06e3aee59d40d3fa6c23a16869' 
  AND token = '+Q9dHugsgq5yV55AvleZolAYCypXWHKhvDdHi1QpYLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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