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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9fc1c11c9a2aa633db471e930c1e8f68d7ddd6da8bdbc90d360ccbe33dece6' 
  AND token = 'kDb4LRw+3/a8P6hWcLzSOzVo5ELPpYwFhR/2V0BSwmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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