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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e7e25ac1a926cdeca434561a665b676552871ef1e3950525a8a80cfa3f0beb' 
  AND token = 'y8b0SLI8abDAO/Eqf7mR1UXUuj75niojgbZ/2OCgFVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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