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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feac24529cb74193a6c4064bcc666a1ac3ae69824112601525ed9d9d589f2555' 
  AND token = 'Rx8tLT714fGgFP00qRzvYVC5avGdqV0NbQxp5NzbLiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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