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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0403090b2247c988e884ea1ee2435fc8a0cdd6e26f05de32ca7c3c5563b0889a' 
  AND token = 'Xz0qQ2La+9HXNklcxXV3Wl7kX3DPNCVN/hXwJhAACpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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