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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3590e7632a5822a61f5bc2a7fad7991e512eed5eb2c0ff54486652e901b31fee' 
  AND token = 'XwdpdvSFoTwnvC4i9xRtda6HuPL36qR/b5Z8b28On/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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