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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f9b7a3547ad7f9d05676c6a0e794bc6bf0958fa3251ac73ce866666be7d16e' 
  AND token = '4matCrBMAY/sndkBW3+BAa1rLl1NMvliBZn9BwRsxDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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