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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a8d89893f883019fa9b1c65a81e9eaff7f00d7008f8e771838c48b7952d664' 
  AND token = 'CEkE4s58SLv1KrqeDePIR1F3mSLi+Vec5FWfrDN/J/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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