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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026a19845504c3015126d3e4a7ed8675c7338df7512fc6afef6b40a06fbb2248' 
  AND token = '6Z3Sr8y8/HI8SnaL4NqvCVfJQiPiXULxWeJNdkYYFNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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