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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f458896aa38e8eb766c0b00271992b8fc3d1a02bf05160d6e5c8991ace56a4b' 
  AND token = 'Gjx8hnO07cWmKwdlFOkw/hGSxhlAgAEQzru3QZ5m7Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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