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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7d56b819306bd9b1a4306c95e2a3239e6985e140daa88a2d638716d8adf3ab' 
  AND token = 'lggC96UxIQqfXtwXDkAHUNP/pcbLkwuIUJ3c3ZNLAbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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