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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581c30cdf696ee0102136b53cd26f2e214a2f17622e72da30bd92f3290e57ca0' 
  AND token = 'ciG965lL1+MfK6YPMe6G7Q8LAFhc+VUJMHDtRmbk2ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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