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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45d00dd7f7af0f7bb7234c72086f71af666e8db9cb502cacf8788fa8e7e0d10' 
  AND token = 'PRMADWAMHwigRSqdI1C5w2fxdLbw+dF1Hn+AabpVRAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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