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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcb2b6edfcc69749c270ed7afad26b79f55cf803a214711043f2d05a43932ee' 
  AND token = '3lsM36Ml81msUPLhdxy/CriEeJ1BjY5hkm/GQlV5kQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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