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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcfe7d942f7b863cdb983bbd0754b2cf9c41ea37ac8352f379133a49ef03771' 
  AND token = '7KPkTTYVvjh0qUl0L9B64vpMDJdBKIdLO2AsMgnS6Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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