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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cf842551fe9122e60791027f5fd467737c1f1580a8cb7a5e30951b3a581d15' 
  AND token = 'lPUMe9HZGoaqPSy+IAE1xc5jADYk2cBJKf7mk7l90ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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