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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c62e9eed11b1bc8071d7eda68005aa0950e84fd59065e0ed37872806fe872c' 
  AND token = 'XhJT1Kk/9v3Xr7hKZtwYaNW0U5rP11deo5/Wc48hJUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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