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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910c3b605fbbe10d06ed7000046e3b6464e967ab2aed011f65f73fdc3435f8d1' 
  AND token = '1yuj8jXyT1HyhBJQLhr1Xtv9JU4J2H0puTRUxBk4xg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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