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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01337d5267af9c6fcb0764a39ae43750911a8a2d1683cc34b1d3b13a7f90b03' 
  AND token = 'vuNrvFifxsvhZ00ryRNV2OpkpsS5aRdR9IxWo33G6Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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