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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3007675476523bfada66fb0f8f11cfbf6ac3770456bcd72c12021a050e8a951' 
  AND token = 'jlpngRpT2yPixVR+by6bMUOpfadZ9eSnIC4dg3S62MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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