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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44bfbbc0ea30ae8a75cf3db49112c194a4a7b7b9173b59154496dee05169e5b' 
  AND token = '+dfy7SBonQahDlf6fwlgguO7jHaFNRPt1NEjHzSIAfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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