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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e4403434ff9985624d661d74cd97036f6b62925150987ddded79288ec955bc' 
  AND token = 'uOhOa8EjeT+MyRN6k7oBMUik2Av2fqco39oaB+k6nNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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