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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4bb04bc828f7e7482813788627aaacf905686003f49ab654c3584bb24bda88' 
  AND token = 'o1FDzpIsf/AWeX01JvGSTOBlE3aH8IS7pOT94CSeVB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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