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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f4e231eb5c33a855ce2fcc7e40c4fd1e157b9c8e86a0e4957d1075a6896957' 
  AND token = 'K6AqOMOx924iI/fSaGXlk+dFy8KmwTeunhJkm+C2jes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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