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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed438aae52f87445f9a8ea3946777cf4d19767d14ae5040b5eaf9fba08cdf07' 
  AND token = 'S43FPNbjmudBy4v6TbXIH2oWbSs1sT+mK919lEM4IR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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