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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03b2502cf4f26a54dd924b589970fa6ee62d9947316664e0f2276bd858e1aa9' 
  AND token = 'xdkG5vdxQS+y4gMi1RD6WRHd9FVSj7/qA5qnZiESpiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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