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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e19ae4d62975aaa2cd7fe1b42de1d8f117dfa3e5f15d1e8ef198417a344f32' 
  AND token = 'xNpLSvfxCUo+zGNUHjTzCG55tv6ma43ZmCKK8POffuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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