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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f7bef72294ff90033b0b745a1a15ffbf0a083bd867222165dd5b737cfeaa17' 
  AND token = 'GLUCqBPsMkN+lqtjrj2W0Iy6n43Si0BlCeE4Lazka4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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