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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd96bd20555f177995a18ef4a673c3437d332fdd984bd17ba197e37c0a269b4' 
  AND token = '6JaIrvtvur2kQS19vpToJJb1uVEY5RFtSVdlzaIyG14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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