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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf5f508741a682301813012c8a9ab21cb058f7c937358c4fe243de22cdbb3bf' 
  AND token = 'KAVWmuO/RNPrRcEZCLPYRo1D2JUpj5ROz+hcD23TQjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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