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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee94c7a67c76e2a0b8ab79b8f809378f71796c786772c0a4086bab3e275d8e77' 
  AND token = '8jQcrXSIhQYgcv0N+xWwkDEkqMgeuzyqSSzFSd0czRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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