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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29074ce270cf0d0b01770e1b36f351ba94dda2237870b105ce34c1338decc04' 
  AND token = '1dkkdxM2N7pGMDh8ZaKjj1GQiZJAwvbKUPPXbW2JLTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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