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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198624a5e692f12446909c978924ba3d693e460d19b3c05dfc12b704c54d57a7' 
  AND token = 'y+Fa2L8X+d1BaRS4H1K/0GxQMC6vQwSRNWTHMcO8bEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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