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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e254f945d1e48a302969ab90bd969a9d7ff3e2ff2dcf085bd754f348ec684b93' 
  AND token = 'OR2TOeXRf7/juUzz5fBbcHrCEks2+EwdjiRwoPjHDxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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