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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b941bfd76e57764684d3fdbdc0d1204ff9155d4d0700ea56ed25af0b026a30' 
  AND token = 'QKbwGAax+T52k+vvyQCoc2GVojQ9QYseTKA7GTm5O2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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