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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4079f7ee088ad17c6187df1af832f3672d647286e96ce80ef4e3c16031fd6963' 
  AND token = 'Bv+5Nx8wFUXZpHaVEO/w0QbuVVi7Ei1JWu5HSnZRe1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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