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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15082b7ac5e1e8c53d91faaa95f0cdf0dacad2b3bd7a16531d3b7ad2fa75669' 
  AND token = '3nGY//TVBZ4JbcwicVfD2JaDbfIMdr8rkfzpokmTD1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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