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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c222c114548a5553a89563aee860702704fff7ca964d3ad6b8031ee5c9d8c4a3' 
  AND token = '+h+1WxN/TVjbtL10+B3Rgnemp4Ex93qxjG+W5kMN2QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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