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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0f87a3f52a0aa2ca7e50c9951df6233dd5ca606037566053973a2fa74e1b57' 
  AND token = 'gfshlL/qRc/bh+V6INc2MlfxI3aZjKb7FX7aZgbZJh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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