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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e7a76ff0ad576b50a41864c7e4a2a502483202b34533fb69585afa5b9cd7c5' 
  AND token = '9FV0B3BV/o3iGeaKIGVMdPt1OnKHeErLKiOs065yil0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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