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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31c7f8d7c4b9235432936ebed789332293286892e877e778a78b938ab045262' 
  AND token = 'EjLF1mYTj8VU+K6otfABaH5ZriYxVRvpz9+01ZNcmU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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