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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a5d2541f55140e69f5969b79a10925cf494a8d65a23b1c66c6a1ebba1e7d7e' 
  AND token = 'BR2Sd4KmNyjD1AukRO98RRjBU4oqVJvIWKlS9pzSEEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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