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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1003427b9ba5c7d4efe8c7a7d3b5505441739fda292899c14738741fc2e58b' 
  AND token = 'koDcJRgjaTQ9HFxi3hw3vNcDw/MT9lJzxpNfrV0PedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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