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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999e9ff8128988f0e7224b193259645a2e0ca3915c7e6256e56d6d6195b2aecc' 
  AND token = 'jMIpkl1OpXccg4GhdXOn1Pu+czE7pRKHXJgUBiirnAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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