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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a90625d24cc57fcbbb99e7f5c43d2014b828befd45853837618aee5a3819ef3' 
  AND token = 'YXkyl9ZexELdSUBMk6jaL0jrZ2eh5lO/FMq/psGV23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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