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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2ca3dca02ce1121d31e5507300c35c286c48edab57c012f53a38ada1c94bd9' 
  AND token = '3Hm+oP7/631JCACVHnypjGtA7Sx+gCwuA9SNuAPQP3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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