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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e35fc9ff30771afe00423cac2108315f7eb524b098a38b609d88ec6e64032d' 
  AND token = 'MdcpNz4hltY+Me+nGbfnr0RdkmMiDtp0P4hkgcYzD3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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