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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6ba61388bfa0c96b8556cbc7bb1dc27bc724464bd64fbe649486a311d30401' 
  AND token = 'RwsCfiPHnSEH1RGQP8a7JDJ0TIxaZERX+4TwSatV/+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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