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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e808ec4fadb615cf6a681287babb5c975d679b01b9e3ff6307fc75e9bf527d50' 
  AND token = 'WjvmJ3I3apSO8rSMjG0FEM6k1DlB4aqj3ARxddCjgKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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