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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016ee5eaf835f6b2d49846dfcfe2e9be7795efce2f6e76c8059a89c4b82408ac' 
  AND token = '/gwgaJijVS7qmI4nKxVLzVMdqMzZ7MUQk0qlPeSJ6Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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